题目

单词拼写：（每小题1分，共10小题） In less than two days 100,000 pieces were put inside twenty-seven_____(木制的) boxes.                                                Li Yan, a___ ( 志愿者 ) for the 2008 Olympic Games, is interviewed by Pausanias.                                                Tom is ___(有信心的) to succeed.                                             Seeing this, many a ___(路人) came to help the old woman.   若三角形三条边长分别是3.1-2a.8.则a的取值范围是（  ） A．a>-5     B．-5<a<-2    C．-5≤a≤-2    D．a>-2或a<-5